The female House Sparrow foraged along the edge of the Sylvan Water. Looks like she got a newly emergent damselfly. She took a look at the big Snapping Turtle and vice-versa.
There are at least four Common Snappers in Green-Wood’s largest water body. This one is third-largest, the shell being about 18″ long. The creature’s neck is perhaps twice as thick as my wrist.
Backyard and Beyond 
Looks like the sparrow had a previous encounter with a snapper. Perhaps a Captain Hookesque one. Tick tock.